Omega B / problem with the engine ?

Moin ! Well people I have some problems with my car and wanted to know if you can help me. To the point: My Omega has the habit no matter in which gear, at a certain number of turns (ca. 1800) rapide with the complete power to go into the cellar. Let’s say so . I drive in the first gear and release the gas at some point. He rolls a little further and when this speed is reached, he breaks down and drives slowly. Like an aggressive motor brake. That happens But as I said in every passage, what is that? Besides, I sometimes have the problem that if I want to drive up the hill at our house in the morning, he does not take any more gas. The accelerator pedal can be pressed down to stop and not even the speed rises. So I have to start up a little and with Karacho up…. But this happens not only on the mountain, can also happen on the straight, shortly after the start. The same with the key. Only after 4-5 times with the key it is closed. Yes… many problems but the car means a lot to me. I thank you for your time and hope for your help.